Blackhawk Mines Corp.

Two of the biggest mining firms in the world, Rio Tinto PLC and BHP Billiton Ltd are teaming up to invest over USD 4 billion to boost their copper output, according to their announcement on Tuesday. Rio and BHP have staked their investment on a high copper demand worldwide as they approve plans for USD 4.5 billion expansion of their Escondida mine in Chile. BHP is even reopening their copper mine that has been out of commission since 2009 due to the global fiscal crisis.